The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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NHS Weight Conversion Chart: Kg to Stone for UK Adults
The NHS uses kilograms for clinical measurements, but most UK adults prefer to understand their weight in stone and pounds. This guide provides a complete NHS weight conversion chart from kg to stone, helping you understand your weight in measurements that make sense for UK health guidance. Whether you're tracking your health, preparing for a GP appointment, or checking your healthy weight range, converting between metric and imperial units is straightforward with the right reference chart.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
How to Convert Kg to Stone Using NHS Standards
The conversion formula is simple: divide your weight in kilograms by 6.35029 to get stone. For example, 70kg divided by 6.35 equals approximately 11 stone. The NHS provides weight charts in kilograms for clinical use, but understanding your weight in stone helps you compare against UK health information and communicate with your GP more effectively.
- 1 stone = 6.35 kg exactly
- 1 kg = 0.157 stone
- To convert kg to pounds: multiply by 2.20462
- Common NHS reference weights appear on this page's weight converter tool above
Use our free weight converter to instantly switch between kg, stone, and pounds. This tool follows NHS measurement standards and is particularly useful when reviewing your NHS health records or comparing your weight against UK clinical guidelines.
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How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS Healthy Weight Ranges by Height in Kg and Stone
The NHS defines healthy weight using BMI (body mass index) between 18.5 and 24.9. For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, NHS guidance recommends slightly lower thresholds due to higher cardiovascular risk at lower BMI levels. Our free BMI calculator above shows your personal healthy weight range instantly in both kg and stone.
For example, an adult who is 1.73m tall (5ft 8in) has a healthy weight range of approximately 55–74kg (8st 10lbs to 11st 10lbs). Your GP can advise if your current weight falls within a healthy range for your individual circumstances, especially if you have existing health conditions.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Why does NHS use kg instead of stone?
The NHS uses kilograms for clinical accuracy and consistency with international medical standards. However, UK patients often prefer stone, so GPs and health services provide conversions. Both measurements are equivalent — it's simply about what feels most familiar to you when discussing your health.
What's the difference between stone and pounds?
1 stone equals exactly 14 pounds. So 11 stone 4 pounds is the same as 158 pounds total. The NHS weight conversion chart on this page shows both measurements to help you understand your weight in the format most useful for your situation.
How do I use this conversion chart with NHS health guidance?
Find your weight in kg on the left column of the chart, then read across to see the equivalent in stone and pounds. Compare this against NHS healthy weight ranges (BMI 18.5–24.9, or lower for South Asian and Black heritage adults). Use our BMI calculator to check if your weight falls within a healthy range for your height.
Is my weight in the healthy range according to NHS standards?
The NHS defines healthy weight by BMI, not by a single number. Your healthy weight depends on your height. Use our free BMI calculator on this page to check your personal healthy weight range in both kg and stone, then discuss any concerns with your GP.
Where can I find official NHS weight guidance?
The NHS website provides weight management guidance at nhs.uk/healthier-weight. You can also speak to your GP for personalised weight advice based on your health history. MyWeightCheck provides free tools like BMI calculators and weight converters to support your understanding of NHS health information.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.